<template>
  <div id="app">
    <nav>
      <router-link to="/">Home</router-link> |
      <router-link to="/about">About</router-link>
    </nav>
     <input type="text" v-model="searchVal" placeholder="请输入内容" @keydown.enter="search">
    <router-view/>
  </div>
</template>
<script>
// import bus from './utils/bus'
export default {
  data(){
    return {
      searchVal: ''
    }
  },
  watch:{
    $route(){
      this.searchVal = "";
    }
  },
  methods: {
    search(){
      // console.log(this.searchVal);
      // 第一个参数是事件名字
      this.$bus.$emit('search',this.searchVal);
    }
  },
}
</script>
<style lang="scss">
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
}

nav {
  padding: 30px;

  a {
    font-weight: bold;
    color: #2c3e50;

    &.router-link-exact-active {
      color: #42b983;
    }
  }
}
</style>
